Pentax specifies the image circle of the "HD Pentax DA AF 1.4X AW Rear Converter" to be up to 35mm full frame. Still, it is named DA.

Therefore and for the first time, we are learning that Ricoh isn't going to name full frame lenses differently from DA.

I agree and it joins what I was saying in an earlier post is that they might actually use this TC to adapt current APS lenses to a new FF body. That would make perfect sense to me but no one seems to believe so

The teleconverter... is labeled DA. But it's compatible with full-frame (or so says dpreview), yet not labeled as a "DFA" tc.

Pentax themselves have never ever given DA any meaning when it comes to crop or FF, it's something users made up. Pentax continuously say that it stands for "digital".

Quote:

DA

The PENTAX DA series of lenses is designed specifically for PENTAX digital SLR cameras. DA lenses are perfectly tailored for use with digital camera sensors, offering a compact, efficient design, with the best combination of price and performance.

Thatīs correct ;-)
FF Patents are DA* 2,8 200 + DA* 4,0 300.
The DA*200 is using the same optical formula like the FA*.
Only the coating is new,the inner parts are new and the ED glas in the middle is new,cause the old ED Type is not exist anymore.
So this element is a new glasmixture.
The converter is also optical fullframe.
The 560 is also working very good with fullframe sensor.
Best regards

It will work well on Digital and Film cameras too.
Like the 100mm/2.8 macro. There are plenty of Pentax film cameras available and people using them.

That was very clear during the introduction of the DA560, for example. Pentax product manager clearly stated the lens was optimised for digital Pentax DSLRs, and that Pentax does not guarantee its optimum performance on Pentax film cameras.